An analytical approach for cased borehole stress calculation in general anisotropic formations

被引:4
|
作者
Wang, Hongwei [1 ,2 ]
Fang, Xinding [1 ]
Zhang, Shuangxi [2 ]
Miao, Miao [1 ]
机构
[1] Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
[2] Wuhan Univ, Sch Geodesy & Geomat, Wuhan, Peoples R China
基金
中国国家自然科学基金;
关键词
anisotropic formation; cased borehole; stress calculation;
D O I
10.1002/nag.3132
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
We present an explicit analytical approach for calculating the distribution of stress around a circular cased borehole in a general anisotropic formation. This approach is developed based on a pure elastic cased borehole model, which can include multiple cemented concentric casing strings that are surrounded by a homogeneous anisotropic medium. The wall of the innermost casing is under the compression of borehole internal fluid pressure, and the formation can be subjected to arbitrary far-field stresses. Every casing-cement boundary is assumed to be welded, so as the cement-formation boundary. The derived analytical solution can be applied to an arbitrary wellbore trajectory in an arbitrary anisotropic formation and is also applicable to degenerate isotropic formations. Accuracy and robustness of the analytical solution is validated through comparing its results with those calculated from the classical Kirsch solution for an isotropic example that has identical elastic properties for all materials and from a finite element method for an anisotropic cased borehole example.
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页码:3 / 27
页数:25
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